Exclusive Photo Flash: The Hills Are Alive! Inside THE SOUND OF MUSIC's Dress Rehearsal with Carrie Underwood, Stephen Moyer & More

The hills are alive- or they will be by tomorrow night when NBC airs its live television special of The Sound of Music (8 PM ET). Theatre fans everywhere are counting down the hours until the event, and to hold you over, BroadwayWorld brings you photos from the cast's dress rehearsal. Get a first look at the cast in action below!

Starring country music star Carrie Underwood as 'Maria,' the cast features Audra McDonald ("Private Practice"), who has won five Tony Awards and two Grammys, as Mother Abbess; Stephen Moyer ("True Blood"), who will play Capt. Georg von Trapp; Tony Award winner Christian Borle ("Smash"), who will portray von Trapp family friend Max Detweiler; and Tony winner Laura Benanti ("Go On"), who will portray Elsa Schrader, the captain's one-time fiancee.

"The Sound of Music," music from the NBC Television event, will include studio recordings for all of the musical numbers that are performed by the cast members in the live broadcast, including Rodgers and Hammerstein favorites "The Sound of Music," "My Favorite Things," "Do-Re-Mi," "Sixteen Going on Seventeen" and "Climb Ev'ry Mountain," among others.

"The Sound of Music," set in the 1930s before and during "Anschluss" when the Nazi's annexed Austria, is based on the romantic true story of Maria von Trapp, an aspiring nun who leaves the abbey to become a governess for the widower Capt. von Trapp's seven children. She soon finds herself falling in love with her employer and questioning her religious calling. It premiered on Broadway in 1959 where it broke box-office records and won the Tony Award forBest Musical. The 1965 film adaptation won the Oscar for Best Picture.

Photo Credit: Will Hart/NBC